The BH51 combines active LED lighting system, Bluetooth call and music play, and other functions. The main body uses an ABS and EPS hybrid material technology, which greatly improves impact resistance, but also reduce weight. The specifically designed noise reduction microphone can filter the external environment noise to guarantee a clear call when riding. Bluetooth speakers are designed in an open style so that you can enjoy music and hear external sounds at the same time. The LED lights are based on a customized program, which realize different smart lighting effects such as braking and turning lights.